Acquisition of a high resolution, sector field, ICP-MS and laser ablation system

EAR-0215297 Ravizza该奖项为夏威夷大学海洋与地球科学与技术学院(SOEST)购买高分辨率扇形场、电感耦合等离子体质谱仪(HR-SF-ICPMS)和激光消融系统提供支持。质谱仪是一种多功能仪器，可用于各种天然物质中的痕量分析，包括海水、沉积物和岩石。激光烧蚀装置允许直接对许多固体材料进行痕量分析，从而消除了耗时和昂贵的化学溶解程序的需要。在SOEST，这一仪器将用于推进化学海洋学、古海洋学、地球化学和火山学的研究工作。对海水中痕量金属的分析将被用来更好地量化向表层海洋供应粉尘的速度及其溶解度。需要这些信息来检验目前的假设，即痕量金属的可获得性限制了大部分公海的生物生产力。海洋生物沉淀的生物成因碳酸钙的微量元素分析将用于提高我们重建海洋温度变化和大气二氧化碳水平波动的历史的能力。这类古海洋学数据被用来确定重大人类影响之前气候变异性的大小和速率。这类数据是区分自然气候可变性和人为气候扰动的努力的重要组成部分。将对海洋沉积物进行微量元素和同位素分析，以阐明化学风化的地质历史。更好地了解化学风化作用是地质界努力了解自然过程的必要组成部分，这些自然过程维持了能够维持宏观生命数亿年的大气。还将进行沉积物地球化学研究，记录环境中铂族元素的浓度。现有数据表明，这些金属是从汽车催化转化器中释放出来的，并在全球广泛分布的地区得到浓缩。这些，以及环境地球化学方面的相关努力，是研究界对评估新出现的人类影响对全球环境的重要性的贡献的一部分。质谱仪和激光烧蚀系统还将为SOEST的几位火山学家和岩石学家的研究计划做出贡献。这些研究人员将痕量元素数据与其他数据集结合起来，以了解地球深处的熔融和岩浆分异过程。这些过程负责在地球表面产生火山活动。研究工作包括研究海底火山作用、岛弧环境中的爆发火山，以及夏威夷大岛上活火山作用提供的独特自然实验室。

EAR-0215297RavizzaThis award provides support to the University of Hawaii's School of Ocean and Earth Science and Technology (SOEST) for acquisition of a high resolution, sector field, inductively coupled plasma mass spectrometer (HR-SF-ICPMS) and laser ablation system. The mass spectrometer is a versatile instrument for trace analysis in a wide variety of natural materials including seawater, sediments and rocks. The laser ablation unit allows direct trace analysis of many solid materials, eliminating the need for time consuming and expensive chemical dissolution procedures. At SOEST this instrumentation will be used to advance research efforts in chemical oceanography, paleoceanography, geochemistry and volcanology. Analyses of trace metals in seawater will be used to better quantify the rate of supply of dust to the surface ocean and it solubility. This information is required to test current hypotheses that trace metal availability limits biological productivity in large portions of the open ocean. Trace element analyses of biogenic calcium carbonate precipitated by marine organisms will be used to improve our ability to reconstruct the history of ocean temperature changes and fluctuations in atmospheric carbon dioxide levels. Paleoceangraphic data of this sort are used to establish the magnitude and rate of climate variability prior to significant human impact. Data of this type is an essential component of efforts to discern between natural climate variability and human-induced climate perturbations. Trace element and isotope analyses of marine sediments will be performed in order to elucidate the geologic history of chemical weathering. A better understanding of chemical weathering is a necessary part of the geologic community's effort to understand those natural processes that have maintained an atmosphere capable of sustaining macroscopic life for hundreds of millions of years. Sediment geochemistry studies that document concentrations of platinum group elements in the environment will also be conducted. Available data indicated these metals are released from automobile catalytic converters and are enriched in widely distributed areas of the globe. These, and related efforts in environmental geochemistry, are part of the research community's contribution to assessing the importance of emerging human impacts on the global environment. The mass spectrometer and laser ablation system will also contribute to the research program of several volcanologists and petrologists at SOEST. These investigators use trace element data in conjunction with other data sets to understand melting in the deep earth, and the magmatic differentiation processes. These processes are responsible for producing volcanic activity at the surface of the Earth. Research efforts include studies of seafloor volcanism, explosive volcanoes in island arc settings, as well as the unique natural laboratory provided by active volcanism on the big island of Hawaii.***